java中有多個類的銀行帳戶客戶端

Question

我想製作一個銀行帳戶程序，但我無法弄清楚如何讓我的所有變量都可見，或者如何使我的每個類都可見，或者如何使取款和存款方法我的代碼可見。任何人都可以看看我的代碼並告訴我什麼是錯的？我只想在客戶端類中輸入和輸出。

感謝

客戶端類

public class Client { 
    public static void main(String args[]) { 
    Scanner input = new Scanner(System.in);  
    System.out.println("Enter your Name: "); 
    String cusName = input.nextLine(); 
    System.out.println("Enter Account Type: "); 
    String type = input.next(); 
    System.out.println("Enter Initial Balance: "); 
    int bal = input.nextInt(); 
    BankAccount b1 = new BankAccount(cusName, num, type, bal); 
    int menu; 
    System.out.println("Menu"); 
    System.out.println("1. Deposit Amount"); 
    System.out.println("2. Withdraw Amount"); 
    System.out.println("3. Display Information"); 
    System.out.println("4. Exit"); 
    boolean quit = false; 
    do { 
     System.out.print("Please enter your choice: "); 
     menu = input.nextInt(); 
     switch (menu) { 
     case 1: 
     b1.deposit(); 
     break; 

     case 2: 
     b1.withdraw(); 
     System.out.println("Current Account Balance=" + Balance); 
     System.out.print("Enter withdrawal amount:"); 
     amount = input.nextInt(); 
     break; 

     case 3: 
     b1.display(); 
     break; 

     case 4: 
     quit = true; 
     break; 
     } 
    } while (!quit); 
    } 
} 

Money類

public class Money 
{ 

    static int accountNumber, Balance, amount; 
    Scanner input = new Scanner(System.in); 
    static String name, actype; 
    public int deposit() { 
    System.out.print("Enter depost amount:"); 
    amount = input.nextInt(); 
    if (amount < 0) { 
     System.out.println("Invalid"); 
     return 1; 
    } 
    Balance = Balance + amount; 
    return 0; 
    } 

    int withdraw() { 

    if (Balance < amount) { 
     System.out.println("Not enough funds."); 
     return 1; 
    } 
    if (amount < 0) { 
     System.out.println("Invalid"); 
     return 1; 
    } 
    Balance = Balance - amount; 
    return 0; 
    } 

} 

BankAccount類

class BankAccount { 
    Scanner input = new Scanner(System.in); 
    static String name, actype; 
    static int bal, amt; 
    Random randomGenerator = new Random(); 
    int accNo = randomGenerator.nextInt(100); 

    BankAccount(String name, int accNo, String actype, int bal) { 
    this.name = name; 
    this.accNo = accNo; 
    this.actype = actype; 
    this.bal = bal; 
    } 
    void display() { 
    System.out.println("Name:" + name); 
    System.out.println("Account No:" + accNo); 
    System.out.println("Balance:" + bal); 

    } 

    void dbal() { 
    System.out.println("Balance:" + bal); 
    } 
} 

Answer 1

1. 添加Money您BankAccount並創建一個getter方法爲：

   class BankAccount { 
       Scanner input = new Scanner(System.in); 
       static String name, actype; 
       static int bal, amt; 
       Random randomGenerator = new Random(); 
       int accNo = randomGenerator.nextInt(100); 
       Money money; 
   
       BankAccount(String name, int accNo, String actype, int bal) { 
       this.name = name; 
       this.accNo = accNo; 
       this.actype = actype; 
       this.bal = bal; 
       this.money = new Money(); 
       } 
   
       public Money getMoney(){ 
       return this.money; 
       } 
       ..... 
   } 
   

2. 使用bankaccount.getMoney()調用deposit和withdraw爲：

   b1.getMoney().deposit(); 
   b1.getMoney().withdraw(); 
   

此外，我會建議，使Money類屬性，例如金額，accntType ...非靜態並通過構造函數進行設置。靜態變量與類定義相關聯，因此您不能通過abl來維護每個銀行賬戶。

Answer 2

屬性的一個對象不應該是一成不變的，比如你的「名稱，動作類型， bal和amt「。此外，我認爲您的錢類應該存在，這些方法可以在銀行賬戶（您從銀行賬戶存入/取出）。

Answer 3

我不會爲你回答這個問題。相反，我將建議您閱讀更多關於Java編程概念的知識，默認情況下會向您解釋。

• Here is one on encapsulation, which is the main concept that you're asking about
• This is a great book on how to write code well, including things like keeping methods short
  • 特別是你的主要方法應該是破碎成小塊
  • 這裏有一個stack overflow question that talks about it，如果你不想買的書。

如果你不想讀這些鏈接，@YogendraSingh回答了這個問題非常好，使用的答案。